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The aFe Twisted Steel 409 stainless steel short-tube header for Jeep Wrangler (YJ/TJ) 1991–1999 4.0L I6 employs pulse control technology with optimized primary tube lengths and mitered collectors to improve flow and velocity across the powerband. Constructed from 14-gauge 409 stainless tubing with TIG welds and a 1/2" thick head flange, the header is a 100% bolt-on upgrade that retains OE emission components and is backed by a limited lifetime warranty.
aFe Twisted Steel Header SS-409 HDR Jeep Wrangler YJ 91-99 I6-4.0L
